SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '052a058927adb92913fb75fd9634f494194323e2a338bb19ff27acd9513ff276' 
  AND token = 'BE//HrcteJDBSdTYV495cbDIT/YKpqFTOawmtUzKHeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}